has side angle side in common with DEF This would imply that ABP E But we are

Has side angle side in common with def this would

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11.1 Triangles 120 C A D B E F Figure 11.5
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11.2 The Parallel Postulate 121 We will prove that the sum of the angles of a triangle is a straight angle. In the approach that we follow, the following partial result is essential. Theorem 11.1.13. The sum of any two angles of a triangle is less than 180 degrees. Proof. Consider an arbitrary triangle ABC as depicted in Figure 11.7, and ex- tend the side AB beyond A as shown. We will show that the sum of angles CAB and ACB is less than a straight angle. A F B M C D
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